Add README

README.md

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+# EssentialsX Website
+
+The EssentialsX website hosted at https://essentialsx.net.
+
+This website is a static site generated using [Saber](https://saber.land/). The site uses the [Bulma](https://bulma.io) and [Buefy](https://buefy.org) frameworks.
+
+## Building
+
+### Set up your environment
+
+1. Ensure you have Git, Node.js and Yarn installed and on your path
+2. Clone the repository
+3. Run `git submodule update --init --recursive`
+4. Run `yarn install`
+
+### Commands
+
+- To start a development server with live reload: `yarn saber`
+- To build a site for deployment: `yarn saber build`
+- To update wiki content: `git submodule update --recursive --remote`